Hey there!!
Basic formula :
... a² - b² = ( a + b ) ( a - b )
Equation given :
... 81x² - 25
... ( 9x )² - ( 5 )²
... ( 9x + 5 ) ( 9x - 5 )
Hope it helps!!
Answer:
$4.59
Step-by-step explanation:
20 - 1.20 - 5.03 = 13.77
13.77/3 = 4.59
Answer:
Step-by-step explanation:
We can add 9 to both sides of the equation to get 
.
We can divide both sides of the equation by 21 to get 
.
We take the square root of both sides of the equation to get 
.
However, that isn't in the form we need.
We know that 
so the answer is really and we're done!
This would simply be y=8x. Which is not one of the options. Are you sure that is the function?
To determine which values of x we would use for creating a graph of a parabola, we need to know where the line of symmetry, or the axis of symmetry is. For that we can use the equation:
y=(x-h)+k, where we know h and k.
From this equation we can see that the line of symmetry is passing trough x=h.
And now we can determine which values do we need to add to h and to subtract from h to get values of x to create the table of values to plot a parabola.
